Based on this product's specifications, here are some alternatives and similar models
Expansion Board Renkforce RF-4011279 RS‑232 Serial Interface
Summary description:
Renkforce Expansion Board RF-4011279 provides an RS-232 serial interface for integrating legacy serial devices with compatible systems. Designed for connection to host boards or controllers, it enables serial communication for data exchange, configuration and control tasks. Suitable for industrial, laboratory or development use where RS-232 connectivity is required.